CN116031997A - Power supply system based on dual-input dual-output dual-backup - Google Patents
Power supply system based on dual-input dual-output dual-backup Download PDFInfo
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- CN116031997A CN116031997A CN202310062492.6A CN202310062492A CN116031997A CN 116031997 A CN116031997 A CN 116031997A CN 202310062492 A CN202310062492 A CN 202310062492A CN 116031997 A CN116031997 A CN 116031997A
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- lithium battery
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- charging
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Abstract
The utility model discloses a power supply system based on double input and double output and double backup, wherein a photovoltaic panel and AC (alternating current) are respectively a first input power supply and a second input power supply of the system; the lithium battery and the super capacitor are respectively a first standby power supply and a second standby power supply of the system; the input end of the power management module is connected with the output end of the photovoltaic panel, and the power management module controls the photovoltaic panel to charge the lithium battery; the power management module is connected to realize control of charging the lithium battery through an AC alternating current power supply when the photovoltaic panel does not meet the charging condition; the power management module is connected with the lithium battery and the super capacitor, and controls the lithium battery or the super capacitor to take electricity according to the electric quantity of the lithium battery; the output end of the power management module outputs the voltage of the main control board, the gear signal input and the motor control module; and the power management module controls the photovoltaic panel or the AC alternating current power supply to charge the lithium battery according to a preset charging curve and a preset discharging curve of the lithium battery.
Description
Technical Field
The utility model relates to the technical field of voltage regulation control of on-load voltage regulation transformers, in particular to a power supply system based on double-input double-output double-backup.
Background
Voltage stability is one of the important indicators of power quality. At present, effective measures for improving voltage stability are as follows: and adjusting reactive power by using the capacitor and the user reactive compensation device, and adjusting voltage by combining with the transformer. The voltage regulation of the transformer is usually realized by an on-load voltage regulating transformer, and the on-load voltage regulating transformer consists of a transformer and a voltage regulating controller. The concept of on-load voltage regulation of the transformer is that when the transformer is in operation, the voltage regulation controller controls the on-load tap changer to realize switching of taps among windings, and the turn ratio of the high-voltage winding and the low-voltage winding is changed, namely the transformation ratio of the high-voltage side and the low-voltage side of the transformer is changed, so that the purpose of voltage regulation is achieved. On the premise of ensuring reactive power, the adjustment of the on-load voltage regulating transformer winding is an important technical means for ensuring that power users obtain good voltage quality. Therefore, on-load tap changers are widely used. The controller realizes automatic control of on-load voltage regulation by controlling the motor operating mechanism, and realizes switching action of the on-load switch. At present, the on-load tap-changer controller has the following problems: the electric power supply is unreliable and uncontrollable due to the influence of external environment and power grid circuits, the accident rate is high, and the maintenance is inconvenient.
The applicant has authorized the utility model with publication number CN216086255U, named: a low-power-consumption on-load voltage regulation controller based on double-input double-output double-backup; comprises a box body; the surface of the box body is provided with a solar photovoltaic panel; and a voltage and current acquisition and conversion circuit, an MCU circuit, a communication module, a gear signal input and motor control module are integrated on a main control board in the box body. The solar photovoltaic panel is electrically connected with the power management module, and the AC power frequency alternating current is electrically connected with the power management module to form double input. The power management module outputs 5V direct current voltage and 24V direct current voltage to form double output. The lithium battery and the super capacitor are electrically connected with the power management module to form a double backup, and the power management module is also used for controlling the switching between the power supplies of the on-load voltage regulation controller. However, how to realize the management of charging and discharging such as AC power frequency alternating current charging, photovoltaic charging, lithium battery power supply, super capacitor power supply and the like through a power management module is a technical problem to be solved at present.
Disclosure of Invention
1. The technical problems to be solved are as follows:
aiming at the technical problems, the utility model provides a power supply system based on double-input double-output double-backup.
2. The technical scheme is as follows:
a dual-input dual-output dual-backup based power supply system, comprising: the device comprises a photovoltaic panel, an AC power supply, a lithium battery, a super capacitor, a power management module, a main control module, a gear signal input and motor control module; the photovoltaic panel is connected with the power management module to serve as a first input power supply of the system, and the AC power supply is connected with the power management module to serve as a second input power supply of the system; the lithium battery is connected with the power management module to serve as a first standby power supply of the system, and the super capacitor is connected with the power management module to serve as a second standby power supply of the system; the power management module provides power for the main control module, the gear signal input and the motor control module.
The input end of the power management module is connected with the output end of the photovoltaic panel, and the power management module controls the photovoltaic panel to charge the lithium battery according to a preset program; the AC power supply is connected with the power supply management module to realize control of charging the lithium battery through the AC power supply when the photovoltaic panel does not meet the charging condition; the photovoltaic panel does not meet the charging condition, and the power generation efficiency of the photovoltaic panel is lower than a preset value due to the fact that the charging condition is weather conditions.
The power management module is connected with the lithium battery and the super capacitor, and the power management module controls whether to put into the lithium battery to take electricity or the super capacitor to take electricity according to the quantity of electricity of the lithium battery.
The output end of the power management module outputs the voltage of the main control board, the gear signal input and the voltage of the motor control module respectively.
The power management module is used for controlling the photovoltaic panel to charge the lithium battery according to a preset program, and specifically comprises the following steps: and the power management module controls the photovoltaic panel or the AC alternating current power supply to charge the lithium battery according to a preset charging curve and a preset discharging curve of the lithium battery.
Further, the preset charging curve of the lithium battery specifically comprises MPPT charging, constant current uniform charging and constant voltage floating charging in sequence.
The MPPT charging is that when the electric quantity of the lithium battery is lower than a preset percentage of the full electric quantity of the lithium battery, the lithium battery is charged by the current output by the photovoltaic panel and the maximum current allowed to be input by the lithium battery; the charging time is as follows:
t=Q/（I*K）
in the above formula, t represents the charging time of a lithium battery, and Q represents the battery capacity; i is charging current; k is a correlation coefficient, and when the charging current is equal to or less than 5% of the battery capacity, the coefficient is 1.6, the coefficient is 1.5 between 5% and 10% of the battery capacity, and the coefficient is 1.3 between 10% and 15% of the battery capacity;
when the constant currents are all the preset percentages exceeding the full capacity of the lithium battery during MPPT charging, charging the lithium battery by adopting preset constant currents until the capacity of the lithium battery is 90% of the rated capacity of the lithium battery; the constant current is the maximum current that the lithium battery is allowed to input.
And the constant-voltage float charge is used for keeping the rated voltage of the output of the lithium battery unchanged, and changing the charging current of the lithium battery until the electric quantity of the lithium battery is equal to the battery capacity of the lithium battery.
Further, a detection and processing circuit is arranged between the photovoltaic panel and the power management module; the detection and processing circuit specifically comprises: after the photovoltaic panel is connected to the anode of the diode, the cathode of the diode is connected to the super capacitor; the negative electrode of the diode is connected with the booster circuit, and the booster circuit is connected to the voltage stabilizer and then connected to one input end of the single-opening double-throw analog switch; the other input end of the analog switch is connected to the lithium battery; the output end of the analog switch is connected to a load; the cathode of the diode is also connected to a power management module.
3. The beneficial effects are that:
(1) According to the utility model, the solar photovoltaic panel is electrically connected with the power management module and is used as a first input power supply of the system, the solar photovoltaic panel can fully fill the lithium battery in the controller box only for a few hours, the charging time is short, and the adaptability to the outdoor rainy environment is strong; the AC power frequency alternating current is electrically connected with the power management module and used as a second input power supply of the system. The input part of the power management module receives the input electric quantity, detects and processes the input electric quantity, and transmits power to the power supply unit, the super capacitor and the battery; the module detects whether the photovoltaic input end is reversely connected or not, and performs input protection according to a detection result; and performing EMC filtering, power control, direct current conversion and the like on the input quantity to obtain the electric quantity with noise-filtering voltage adaptation, so that the electric quantity meets the subsequent power supply requirement.
(2) In the utility model, a lithium battery is electrically connected with a power management module and is used as a first standby power supply of the system; the super capacitor is electrically connected with the power management module and is used as a second standby power supply of the system, and the super capacitor is used as a standby mode in the method, so that when the alternating current power supply is cut off and the lithium battery power is insufficient, the super capacitor can be rapidly put into use, and favorable conditions are provided for the controller to timely store current data information and transmit fault information.
(3) The power management module can also be used for controlling the power of the on-load voltage regulation controller to be switched from a lithium battery, a super capacitor, a photovoltaic panel or an alternating current power frequency alternating current power supply in a seamless mode.
Drawings
FIG. 1 is a schematic diagram of a low power consumption on-load voltage regulator controller based on dual input dual output dual backup according to the present utility model;
FIG. 2 is a schematic diagram of a photovoltaic charging system in a dual-input dual-output dual-backup based power supply system;
fig. 3 is a graph 1 of charging efficiency of a photovoltaic panel of a dual-input dual-output dual-backup power supply system for charging a battery according to the present utility model;
fig. 4 is a graph 2 of charging efficiency of a photovoltaic panel of a dual-input dual-output dual-backup power supply system for charging a battery according to the present utility model.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the overall structure of a low-power-consumption on-load voltage regulation controller 1 based on dual-input dual-output dual-backup related to the present application is schematically shown, the controller is a box structure, a solar photovoltaic panel is arranged on the upper surface of the box, and a main control board, a lithium battery, a super capacitor and a power management module are arranged in the box. The on-load voltage regulation controller supports a method of acquiring power through an external solar panel, the output power of the power management module can meet the power requirement of the operation of the stepping motor, and the maintenance cost is reduced.
As shown in fig. 1, the power management module of the controller is integrated in an on-load voltage-regulating controller, the controller is connected with an on-load voltage-regulating transformer, and the transmission device is controlled by controlling voltage regulation, so that switching of a gear-shifting switch of the transformer is realized. The power supply system of the power supply needs to meet the following requirements: the lithium battery management function of automatic charge and discharge, overcharge, overdischarge prevention, passivation and the like is achieved; the battery has output short-circuit protection, battery reverse connection and short-circuit protection functions; the system has a seamless switching function of instantaneously switching from the power supply of the previous stage of system input to the power supply of the lithium battery pack; the power-off alarm, low-voltage alarm and under-voltage protection function of the working power supply and the alarm signal uploading function are provided; supporting the uploading function of parameters such as the charging duration time, the lowest possible drop of the battery by at most a few V, the actual voltage of the current battery and the like; has the functions of overcurrent protection and the like.
As shown in fig. 2, is a photovoltaic part circuit connection in the present application. The photovoltaic charging adopts three-section charging management, MPPT charging, constant voltage uniform charging and constant voltage floating charging, the service life of the lithium battery is greatly prolonged, MPPT tracking efficiency is more than or equal to 99.9%, system power generation efficiency is up to 98%, system efficiency is improved, and system cost is reduced. The charging efficiency verification is shown in fig. 3 and 4, and fig. 3 and 4 show the charging efficiencies obtained by charging the lithium battery by three photovoltaic panels with 32V, 36V and 40V output charging voltages respectively. Fig. 3 shows that the charging efficiency of the lithium battery can reach 98% under the condition of a certain charging voltage according to the output power of the photovoltaic panel. Fig. 4 shows a charging efficiency of the photovoltaic panel for charging the lithium battery under a certain charging voltage according to a charging current of the lithium battery, and a charging effect is as high as 98%.
In this scheme, power module supports power frequency alternating current and solar photovoltaic dual input mode, and output can satisfy the power requirement of step motor operation, and the maintenance of being convenient for reduces cost. The lithium battery and the super capacitor are adopted as a double-backup mode, and compared with a lead-acid battery, the lithium battery has better performance in terms of environmental protection, safety and service life. The solar panel can be selected to be 80W/36V, the 12AH lithium battery pack can be fully charged in about 7 hours, and the solar panel can be charged rapidly, so that the long-term overcast and rainy weather interference can be overcome. The power supply terminal is automatically and seamlessly switched under various working conditions, and the problem of stable and reliable power supply of the terminal is solved. When the weather is clear, a solar panel is selected to take electricity, and meanwhile, the lithium battery is charged; in rainy days or at night, the power supply module can be automatically switched to a lithium battery power-taking mode.
Photovoltaic power generation, which is a distributed power generation mode, has gradually been connected to an existing power distribution network, and the power is proportional to the surface illumination area, but the size suitable for installation needs to be selected. A certain type of solar panel is selected, the rated output voltage is 36VDC, the maximum output power is 80W, and the output current is about 2.2A. The maximum charging current of the solar power taking channel can be set to be 2A, and when the charging current is 2A, the battery is full of the solar power taking channel only for 0.6h under the working condition, so that the charging time is greatly shortened.
In this scheme, photovoltaic charging adopts syllogic charge management to be promptly: MPPT charging, constant-current uniform charging and constant-voltage floating charging, as shown in figures 3 and 4, can greatly prolong the service life of the lithium battery, the MPPT tracking efficiency is more than or equal to 99.9%, the system power generation efficiency is up to 98%, and the system efficiency is improved and the system cost is reduced.
While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the scope of the utility model shall be limited only by the claims appended hereto.
Claims (3)
1. The utility model provides a power supply system based on two backups of dual input dual output which characterized in that: comprising the following steps: the device comprises a photovoltaic panel, an AC power supply, a lithium battery, a super capacitor, a power management module, a main control module, a gear signal input and motor control module; the photovoltaic panel is connected with the power management module to serve as a first input power supply of the system, and the AC power supply is connected with the power management module to serve as a second input power supply of the system; the lithium battery is connected with the power management module to serve as a first standby power supply of the system, and the super capacitor is connected with the power management module to serve as a second standby power supply of the system; the power management module provides power for the main control module, the gear signal input and the motor control module;
the input end of the power management module is connected with the output end of the photovoltaic panel, and the power management module controls the photovoltaic panel to charge the lithium battery according to a preset program; the AC power supply is connected with the power supply management module to realize control of charging the lithium battery through the AC power supply when the photovoltaic panel does not meet the charging condition; the photovoltaic panel does not meet the charging condition, and the power generation efficiency of the photovoltaic panel is lower than a preset value due to the fact that the charging condition is the weather condition at the time;
the power management module is connected with the lithium battery and the super capacitor, and the power management module controls whether to put into the lithium battery to take electricity or the super capacitor to take electricity according to the quantity of electricity of the lithium battery;
the output end of the power management module outputs the voltage of the main control board, the voltage of the gear signal input and motor control module respectively;
the power management module is used for controlling the photovoltaic panel to charge the lithium battery according to a preset program, and specifically comprises the following steps: and the power management module controls the photovoltaic panel or the AC alternating current power supply to charge the lithium battery according to a preset charging curve and a preset discharging curve of the lithium battery.
2. The dual input dual output dual backup based power management module of claim 1, wherein: the preset charging curve of the lithium battery is specifically MPPT charging, constant current uniform charging and constant voltage floating charging in sequence;
the MPPT charging is that when the electric quantity of the lithium battery is lower than a preset percentage of the full electric quantity of the lithium battery, the lithium battery is charged by the current output by the photovoltaic panel and the maximum current allowed to be input by the lithium battery; the charging time is as follows:
t=Q/（I*K）
in the above formula, t represents the charging time of a lithium battery, and Q represents the battery capacity; i is charging current; k is a correlation coefficient, and when the charging current is equal to or less than 5% of the battery capacity, the coefficient is 1.6, the coefficient is 1.5 between 5% and 10% of the battery capacity, and the coefficient is 1.3 between 10% and 15% of the battery capacity;
when the constant currents are all the preset percentages exceeding the full capacity of the lithium battery during MPPT charging, charging the lithium battery by adopting preset constant currents until the capacity of the lithium battery is 90% of the rated capacity of the lithium battery; the constant current is the maximum current allowed to be input by the lithium battery;
and the constant-voltage float charge is used for keeping the rated voltage of the output of the lithium battery unchanged, and changing the charging current of the lithium battery until the electric quantity of the lithium battery is equal to the battery capacity of the lithium battery.
3. The dual input dual output dual backup based power management module of claim 1, wherein: a detection and processing circuit is arranged between the photovoltaic panel and the power management module; the detection and processing circuit specifically comprises: after the photovoltaic panel is connected to the anode of the diode, the cathode of the diode is connected to the super capacitor; the negative electrode of the diode is connected with the booster circuit, and the booster circuit is connected to the voltage stabilizer and then connected to one input end of the single-opening double-throw analog switch; the other input end of the analog switch is connected to the lithium battery; the output end of the analog switch is connected to a load; the cathode of the diode is also connected to a power management module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310062492.6A CN116031997A (en) | 2023-01-19 | 2023-01-19 | Power supply system based on dual-input dual-output dual-backup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310062492.6A CN116031997A (en) | 2023-01-19 | 2023-01-19 | Power supply system based on dual-input dual-output dual-backup |
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| Publication Number | Publication Date |
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| CN116031997A true CN116031997A (en) | 2023-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310062492.6A Pending CN116031997A (en) | 2023-01-19 | 2023-01-19 | Power supply system based on dual-input dual-output dual-backup |
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